Record of Geology of Texas, 188 7- 1896. 
87 
Rumble^ Edwin T. 
Museum, Library, Office. ‘.Results: Introduction, Topography, Oeology. 
iGrulf 'Coast formations — lOoast Clays, iFayette Reds, Timber Belt beds; 
Lignite, Laredo Coal. Rasal Clays; Iron Ores. Cretaceous; Upper, 
Lower. The Central Basin Formations — 'Archaean, Eparchaean, Ores, Pale- 
ozoic — Oambrian, Silurian, Devonian, Carhoniferous, Coal, Permian. Meso- 
zoic — Jura-Trias. Artesian Water. Personnel. Acknowledgments. 
122. — , and Hill, R. T. 
See Hill, R. T., and Dnnible, E. T. 
The Igneous Rocks of Central Texas. 
Proc. Amer. Assoc, for Adv. of Science, Yol. XXXVIII, pp. 
242-243. 1890. 
123. 
Report of Professor E. T. Hnmhle, State Geologist of Texas, on 
the Existence of Artesian Waters West of -the Xinety-seventh Meri- 
dian, etc. (Submitted with the Report of Richard J. Hinton, Spe- 
cial Agejit in Charge of the ^Preliminary Investigation to determine 
the proper location of Artesian Wells within the Area of the Xinety- 
seventh Meridian and East of the Foot-hills of the Rocky Monn^ 
tains.^^) 
51st 'Congress, 1st Session, Senate Execntive Docnment, Xo 
222, pp. 99-102. Washington, 1890. (Accompanying this docu- 
ment there is a map of West Texas showing the locatiorL of 
Artesian wells.) 
This paper is in reply to a request of the Special Agent ‘‘for a statement 
as to the existing artesian water conditions 'of that portion of Texas west 
of the ninety-seventh meridian and north of San Antonio,” and is pub- 
lished under the direction of the Secretary of Agriculture. 
“The part of .the State covered by your request includes four topo- 
graphic divisions. First, in its eastern part we find a small area of the 
Oulf coast formation followed by the plateau of Grand Prairie. From the 
northern and western scarp of this plateau the Central Basin region 
'Stretches away west to the Guadaloupe Mountains, beyond which .we find 
the mountain region of Trans-Pecos Texas.” 
The small exposure of the Gulf Coast formation (Upper Cretaceous, 
Lower and Middle Tertiary) are too limited in area to need description. 
'Description of the Grand Prairie. “The western and northern edge of 
the Grand Prairie is, generally speaking, topograp.hioally higher than the 
eastern and the southern, land the dip of the beds is very gentle towards the 
southeast. The rock formation of this plateau belongs to the Lower Cre- 
taceous series, and consists of a great thickness of limestones and chalks, 
magnesian, arenaceous and even argillaceous in places, which is under- 
laid by a bed of sands. * * 
“This bed, the Trinity or Upper Cross Timber Sands, is the base of the 
Lower iCretaceous System, .and is the great water-bearing bed east and 
south of the central basin, * * 
